Heat 1 tbsp of the oil in a large skillet over medium heat. Add the onion and cook until softened, about 3 minutes. Add the Artichoke hearts, lemon, and thyme (if desired). Cook until heated through, 3 more minutes. Transfer to a plate. Season the tuna with the salt and pepper. Heat the remaining oil in the skillet. Cook the tuna, turning to brown all sides, to desired doneness, about 2 minutes for medium. Return the artichoke mixture to the skillets and toss.

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